2221650 has 36 divisors (see below), whose sum is σ = 5970042. Its totient is φ = 592320.

The previous prime is 2221633. The next prime is 2221657. The reversal of 2221650 is 561222.

It can be written as a sum of positive squares in 3 ways, for example, as 1580049 + 641601 = 1257^2 + 801^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (2221657) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2019 + ... + 2918.

2^2221650 is an apocalyptic number.

2221650 is an abundant number, since it is smaller than the sum of its proper divisors (3748392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2221650 is a wasteful number, since it uses less digits than its factorization.

2221650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4955 (or 4947 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 2221650 is about 1490.5200434748. The cubic root of 2221650 is about 130.4843862061.

Adding to 2221650 its reverse (561222), we get a palindrome (2782872).

The spelling of 2221650 in words is "two million, two hundred twenty-one thousand, six hundred fifty".